package com.bbc.commonbackstage.web.controller.monitor;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.bbc.commonbackstage.common.constant.CacheConstants;
import com.bbc.commonbackstage.common.core.domain.AjaxResult;
import com.bbc.commonbackstage.common.utils.StringUtils;
import com.bbc.commonbackstage.system.domain.SysCache;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.util.*;

/**
 * 缓存监控
 *
 * @author ruoyi
 */
@Api(tags = "缓存监控")
@RestController
@RequestMapping("/monitor/cache")
public class CacheController
{
    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    private final static List<SysCache> caches = new ArrayList<SysCache>();
    {
        caches.add(new SysCache(CacheConstants.LOGIN_TOKEN_KEY, "用户信息"));
        caches.add(new SysCache(CacheConstants.SYS_CONFIG_KEY, "配置信息"));
        caches.add(new SysCache(CacheConstants.SYS_DICT_KEY, "数据字典"));
        caches.add(new SysCache(CacheConstants.CAPTCHA_CODE_KEY, "验证码"));
        caches.add(new SysCache(CacheConstants.REPEAT_SUBMIT_KEY, "防重提交"));
        caches.add(new SysCache(CacheConstants.RATE_LIMIT_KEY, "限流处理"));
        caches.add(new SysCache(CacheConstants.PWD_ERR_CNT_KEY, "密码错误次数"));
    }

    /**
     * 获取Redis的详情信息
     */
    @ApiOperation("获取Redis的详情信息")
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping()
    public AjaxResult getInfo() throws Exception
    {
        Properties info = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info());
        Properties commandStats = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info("commandstats"));
        Object dbSize = redisTemplate.execute((RedisCallback<Object>) connection -> connection.dbSize());

        Map<String, Object> result = new HashMap<>(3);
        result.put("info", info);
        result.put("dbSize", dbSize);

        List<Map<String, String>> pieList = new ArrayList<>();
        Optional.ofNullable(commandStats).ifPresent(i -> {
            i.stringPropertyNames().forEach(key -> {
                Map<String, String> data = new HashMap<>(2);
                String property = commandStats.getProperty(key);
                data.put("name", StringUtils.removeStart(key, "cmdstat_"));
                data.put("value", StringUtils.substringBetween(property, "calls=", ",usec"));
                pieList.add(data);
            });
        });
        result.put("commandStats", pieList);
        return AjaxResult.success(result);
    }

    /**
     * 获取系统Redis缓存列表
     */
    @ApiOperation("获取系统Redis缓存列表")
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getNames")
    public AjaxResult cache()
    {
        return AjaxResult.success(caches);
    }

    /**
     * 根据缓存名称模糊查找指定缓存
     *
     * @param cacheName 缓存名称
     */
    @ApiOperation("根据缓存名称模糊查找指定缓存")
    @ApiImplicitParam(name = "cacheName", value = "缓存名称", paramType = "path", dataTypeClass = String.class, required = true)
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getKeys/{cacheName}")
    public AjaxResult getCacheKeys(@PathVariable String cacheName)
    {
        Set<String> cacheKeys = redisTemplate.keys(cacheName + "*");
        return AjaxResult.success(cacheKeys);
    }

    /**
     * 获取指定缓存
     *
     * @param cacheName 缓存名称
     * @param cacheKey 缓存key
     */
    @ApiOperation("获取指定缓存")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "cacheName", paramType = "path", dataTypeClass = String.class, value = "缓存名称", required = true),
            @ApiImplicitParam(name = "cacheKey", paramType = "path", dataTypeClass = String.class, value = "缓存key", required = true)
    })
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @GetMapping("/getValue/{cacheName}/{cacheKey}")
    public AjaxResult getCacheValue(@PathVariable String cacheName, @PathVariable String cacheKey)
    {
        String cacheValue = redisTemplate.opsForValue().get(cacheKey);
        SysCache sysCache = new SysCache(cacheName, cacheKey, cacheValue);
        return AjaxResult.success(sysCache);
    }

    /**
     * 清空指定缓存名称
     *
     * @param cacheName 缓存名称
     */
    @ApiOperation("清空指定缓存名称")
    @ApiImplicitParam(name = "cacheName", paramType = "path", dataTypeClass = String.class, value = "缓存名称", required = true)
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheName/{cacheName}")
    public AjaxResult clearCacheName(@PathVariable String cacheName)
    {
        Collection<String> cacheKeys = redisTemplate.keys(cacheName + "*");
        // 清空缓存
        if(CollectionUtils.isNotEmpty(cacheKeys)) {
            redisTemplate.delete(cacheKeys);
        }
        return AjaxResult.success();
    }

    /**
     * 清除指定缓存key
     *
     * @param cacheKey 缓存key
     */
    @ApiOperation("清除指定缓存key")
    @ApiImplicitParam(name = "cacheKey", paramType = "path", dataTypeClass = String.class, value = "缓存key", required = true)
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheKey/{cacheKey}")
    public AjaxResult clearCacheKey(@PathVariable String cacheKey)
    {
        redisTemplate.delete(cacheKey);
        return AjaxResult.success();
    }

    /**
     * 清空所有缓存
     */
    @ApiOperation("清空所有缓存")
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")
    @DeleteMapping("/clearCacheAll")
    public AjaxResult clearCacheAll()
    {
        Collection<String> cacheKeys = redisTemplate.keys("*");
        redisTemplate.delete(cacheKeys);
        return AjaxResult.success();
    }
}
